I have had and continue to have nothing but problems with the supposed "upgrade" to the t-type steering. The original y-type system lasted 180k in all manner of road conditions, sizes of tires up to 33", and heavy towing from coast to coast and border to border. In the intervening 100k I have rebuilt the drag link twice and the tie rods are now loose enough they are creating problems. I have used both moog and OE pieces and there seems to be little difference in wear ability. In addition the steering has never been as consistent and tight as the y-type even with the big box upgrade. More consistent with the big box but the center feel has never be what would be called "good". With the fast ratio Borgeson box the over steer was terrible on direction change and brutal in the center position, was always chasing a static position. the big box is better with the slower ratio but still too much required to get going either direction from center. With stock height bump steer was minimal, with longer springs and basically a 3" leveling system bump steer is terrible. On smooth even surfaces it is fine but that is not the norm pretty anywhere I have been, definitely not where I live.
The front end has been rebuilt with a heim end track bar and poly bushings, control arms rebuilt with poly bushings, caster is set to 4 degrees, sway bar links updated, dual opposed steering dampers,everything is tight with the only real movement at rest being the poly bushing on the frame end of the track bar. In normal driving I am seeing in excess of 1/2 inch to 1 inch of steering wheel movement of bump steer in normal suspension cycling, more in big changes. The ride is great with the Thuren soft ride springs and on a smooth level surface it is dead straight and consistent. Loaded the feel is better as the suspension doesn't move as much.
I ma lucky enough to have a comparison vehicle to judge against. My son has the same truck, same leveling with wider and taller tires that usually contribute more of the sloppy feel especially on substandard surfaces. The difference is a cross over steering setup with the track bar and drag much better aligned to run in the same plane. It is running a fast ratio Borgeson box and NO steering damper. The difference on the same roads is night and day. Very minimal bump steer and only in the worst conditions, and, the over all feel is much "tighter" with control much more exact coming off center and with direction changes. Once you drive a steering system that is good, you wonder why this was EVER considered an upgrade in the first place. One also sees why all the new trucks have gone to cross over steering and why.
SKF is wrong and greasing the unit bearings is a common practice, 2nd or 3rd gen. The bearings are sealed externally but not internally so it is possible to grease them. Grease is pumped into the hub thru the ABS sensor hole using an adapter that will fit tightly in the hole using the ABS hold down screw to hold it. Loosening the axle shaft nut allows more of a void to fill with grease and easier migration to the rollers but it will migrate even without loosening the axle nut. Drilling and tapping a zerk works probably a little better as it can be put closer to the joint of mating of the bearings.
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